He had a pretty reliable exploit on the most used browser, pretty sure it he could have gotten more tax free on the black market. Now, with EDR widely deployed it's likely that the exploit usage ends up being caught sooner than later, but pretty sure some dictatorship intelligence agency would have found all those journalists deep compromise worthwhile...
What if people start asking questions where you got the million dollars from? I've never understood how those presumably illegal markets can function with such large sums involved.
You'll think of something. If you can hack one system, you can hack another.
$250k fully legally and with recognition is probably a good incentive not to bother. White hats have their privileges.